Improvement in the manufacture of cast-iron for car-wheels



UNITED STATES PATENT, FFIGE.

CHARLES BURGESS, OF PORTSMOUTH, OHIO.

IMPROVEMENT IN THE MANUFACTURE OF CAST-IRON FOR CAR-WHEELS, a.

Specification forming part of Letters Patent No. 143,874, dated October21, 1873; application filed September 9, 1873.

To all whom it may concern: 7

Be it known that I, CHARLES BURGESS, of

7 Portsmouth, Scioto county, Ohio, have in Vented an ImprovedManufacture of Gast- Iron for Car -Wheels and other chilled articles, ofwhich the following is a specification: This invention relates primarilyto the production and use of a superior and cheap article of iron forchilling purposes.

One mode of carrying out my invention may be described as follows: I putthrough my refining process, as described in my patent of August, 1873,hot-blast iron, (stone-coal pig or toughness, and gives the requiredstrength.

The'refined iron imparts the chilling properties to the composite metal.The refined iron ,is equally adapted for malleable-iron casting,

in place of a high-priced cold-blast iron, and for casting into plowsand agricultural implements, where a hard, good wearing iron isrequired. It is also highly adapted to be manufactured into bells, owingto its clearness; also, for the manufacture of chilled rolls. Incombining the refined metal with soft-gray iron, no

specific proportions can be observed, owing to the variation in thequality and properties of such iron; but, in determining the properproportions in individual cases, the ordinary skill of founders is allthat is required.

I do not claim to make by my process partsteel castings. My refined castiron is not steel, or wrought iron, or semi steel, but a fined orpartially-refined cast-iron thatcan be charged with the pig in a cupolaor air or gas furnace of any kind, such as is ordinarily used formelting iron for casting. The fined cast-iron will fuse regularly withthe pig-iron, or the fined cast-iron may be melted separately and at thesame temperature that will melt ordinary pig-iron. With my refined ironI combine the usual strong soft-gray iron in suitable proportions, asexplained.

I have found the following mixtures to produce satisfactory results:Hot-blast strong cast-iron, two-tenths; cold-blast strong castiron,three-tenths refined cast-iron, five-tenths; hot-blast strong iron,three-tenths; cold-blast strong iron, three-tenths; refined cast-iron,four-tenths 5 hot-blast strong iron, three-tenth s; cold-blast strongiron, two-tenths; old wheels, two-tenths; stone-coal strong iron,one-tenth refined cast-iron, two-tenths; cold-blast strong, form-tenths;refined cast-iron, six-tenths; hotblast strong iron, four-tenths;refined cast-iron, six-tenths; hot-blast soft iron, five-tenths; re-

fined cast-iron, five-tenths cold-blast soft, fivetenths; refinedcast-iron, five-tenths.

There is no more waste where I use six-tenths of the refined cast-ironthan where I only use three-tenths or one-tenth, as it melts or fusesequally and regularly with the other iron, and mixes thoroughly. Icannot state any one certain mixture or proportion of the refinedcast-iron that I use; it is left to the judgment of the man who has thecharge of mixing the irons, as it is in all cases where he can perceive"the qualities of his strong or soft irons. If the iron is of a very softnature it requires more of the refined iron to give the desired chillthan when the iron is a little harder.

My refined iron can be used to any extent, as may be desired, withoutany more waste than when only a small portion is employed.

Any cast iron will give the desired chill when refined, even the mostcommon stonecoal or anthracite soft-gray iron to the best cold-blastcharcoal soft iron that has no chilling properties before refining. Icontemplate using this fined cast-iron from one-tenth to more than fiveor six tenths, if the quality of the soft pig requires it. 7

My invention is chiefly based on the discovery that fining or partiallyrefining iron which was not adapted for chilling imparts to it achilling property.

The invention is not limitedin its application to theuse of iron refinedby my peculiar process, but may be applied, though less econemically, bythe use of cast'iron refined by other modes.

My composite iron is not limited in its utility to the production ofchilled castings but is useful. for castings in general where the metalis especially required to possess great strength and hardness-es, forexample, 111 rolling-mill rolls, cog-Wheels, 850., whether chilled ornot.

"I claim as new, and desire to secure by Let-- ters Patent- 1.. Thecomposite cast-iron herein described, consisting of fined orpartially-refined cast-iron and soft-gray cast-iron fused together, substentially as set forth.

2. The combination of a fined or partiallyrefined cast-iron with asoft-gray cast-iron for the production of chilled castings, or for otherpurposes.

In testimony of which invention I hereunto set my hand.

- CHARLES BURGESS.

Attest:

G120. H. KNIGHT,

B. I PEREGEINE.

